I just ran the heat gun over the panel at about the pace you would move a paint brush.
No need to hold it in one palce for long as the bubble show almost immediately.
If you get a bubble then hold it there a little longer to make sure it expands properly.
It really doesn't take long, about 1 hour to do the whole body shell. I suspect your early body shells were better because my G46 was really quite shoddy
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